Safety plugs for power ports

ABSTRACT

Safety plugs for power ports are disclosed. A safety plug in accordance with embodiments of the invention includes a body having a first end adapted to be inserted into a power port; a locking device connected to the body for reversibly engaging an inside of the power port; and a control device operatively coupled to the locking device for disengaging the locking device from the inside of the power port, wherein the control device comprises a child-resistant mechanism.

BACKGROUND OF INVENTION

1. Field of the Invention

The invention relates generally to plugs for power ports. Moreparticularly, the invention relates to safety plugs with a child-proofmechanism.

2. Background Art

With more and more electronic devices, such as personal radios, cassetteplayers, CD players, televisions, and DVD players, proliferating to ourliving environment outside the homes, new cars and boats often areequipped with multiple power ports. The days of having only one powerport to be shared between a cigarette lighter and other electronicdevices seem to be gone. While the additional power ports provideconvenience to the users, they may present hazards to small children.

The additional power ports in the automobiles or boats are typicallycovered with simple devices to prevent foreign objects from beingaccidentally introduced into them. FIG. 1 shows one example of a typicalcover used in most power ports. As shown, a cover 52, which is typicallymade of plastic, is attached to the opening 53 of the power port 51. Thecover 52 is pressed into the opening 53 to close the power port. Thecover 52 engages the power port by interference fit and can be easilyremoved by a curious child.

Once the cover 52 is opened, the electrical terminals (not shown) insidethe power port 51 become accessible to the curious little hands andfingers. A child may stick his fingers into the power port. This mayresult in injuries to the child. Alternatively, the child may shoveforeign objects into the power port. If paper clips or liquids areintroduced into the power port, damages may result to the automobiles orboats, and the child may be injured.

Therefore, it is desirable that better power port covers or plugs thatcannot be easily removed by children are available. In addition, it isdesirable that such covers or plugs may serve other useful functions.

SUMMARY OF INVENTION

In one aspect, the invention relates to safety plugs for power portssuch as those found in an automobile or a boat. A safety plug inaccordance with one embodiment of the invention includes a body having afirst end adapted to be inserted into a power port; a locking deviceconnected to the body for reversibly engaging an inside of the powerport; and a control device operatively coupled to the locking device fordisengaging the locking device from the inside of the power port,wherein the control device comprises a child-proof mechanism.

A safety plug in accordance with one embodiment of the invention mayfurther include at least one electrical contact on the first end of thebody for conducting electricity from the power port; and an electricaldevice disposed proximate to a second end of the body and electricallyconnected to the at least one electrical contact, wherein the electricaldevice is configured to be powered by the electricity from the powerport.

Other aspects and advantages of the invention will be apparent from thefollowing description and the appended claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 shows a prior art power port cover attached to a mobile powerport.

FIG. 2 shows a schematic of a safety plug in accordance with oneembodiment of the invention.

FIG. 3 shows a safety plug in accordance with another embodiment of theinvention.

FIG. 4 shows a safety plug in accordance with another embodiment of theinvention.

FIG. 5 shows a safety plug illustrating a locking device in accordancewith one embodiment of the invention.

FIG. 6 shows a safety plug illustrating another locking device inaccordance with one embodiment of the invention.

DETAILED DESCRIPTION

Embodiments of the invention relate to safety plugs for power ports,such as those found in automobiles and boats. A safety plug inaccordance with embodiments of the invention includes a locking device.The locking device can be disengaged by a control device with achild-proof mechanism. Therefore, a safety plug in accordance withembodiments of the invention can prevent children from pulling thesafety plug out of a power port.

FIG. 2 illustrates a schematic of a safety plug in accordance with oneembodiment of the invention. As shown, the safety plug 100 comprises abody 10 that has a first end 11 and a second end 12. The first end 11 ofthe safety plug 100 is adapted to be inserted into a power port (orelectric socket, shown as 51 in FIG. 1). The safety plug 100 alsoincludes a locking device 13, which is controlled by a control device20.

The locking device 13 engages the inside of the power port (socket) toprevent it from being removed. In preferred embodiments, the lockingdevice 13 is configured to the locked state by default. Alternatively,the locking device 13 may be switched to the locked state after it isinserted into a power port. To remove the safety plug 100 from the powerport, the control device 20 is activated. Activation of the controldevice 20 disengages the locking device 13 and converts it to theunlocked state to allow the safety plug 100 to be removed.

In accordance with embodiments of the invention, the control device 20has a child-proof mechanism that may be activated in a counter-intuitivemanner such that a child is less likely to pull the safety plug 100 outof the power port. Examples of child-proof mechanisms may include thefollowing. The control device 20 may need to be “pushed” in, while thesafety plug 100 is being “pulled” out of the power port. The controldevice 20 may need to be turned to a specific angular position, like achild-proof medicine bottle, before the safety plug 100 can be removedfrom the power port, The control device 20 may need to be turned to onedirection and then the other, like a combination lock, before thelocking mechanism 13 is disengaged from inside the power port. One ofordinary skill in the art would appreciate that other variations of thechild-proof mechanism may be used with embodiments of the invention,and, therefore, the invention is not limited to these specific examples.

The control device 20, which may include a shaft slidably disposed inthe body 10, is attached at its first end 21 to the locking device 13,while the second end of the control device 22 may protrude from thesecond end 12 of the body 10 of the safety plug 100. The protrusion ofthe second end 22 allows a force to be applied to rotate or push thecontrol device 20 towards the first end 11 of the body 10. Thus, theforce needed to unlock the locking device 13 is applied in an oppositeor orthogonal direction relative to the force needed to pull the safetyplug 100 out of a power port.

FIG. 2 illustrates minimum features of a safety plug 100 in accordancewith one embodiment of the invention. According to some embodiments ofthe invention, the safety plug may further include other components toenhance its utility. As shown in FIG. 3, a safety plug 200 in accordancewith one embodiment of the invention also includes an attachment 15. Theattachment 15 may be attached to the second end 12 of the body 10 or tothe second end 22 of the control device 20. If the attachment 15 isattached to the second end 12 of the body 10, then it may have anopening to allow access to the control device 20. Alternatively, thecontrol device 20 may protrude from the side of the attachment 15.

The attachment 15 may be any item that enhances the utility and/oraesthetic of the safety plug 200, such as a picture, a display, a sign(e.g., a no smoking sign), an air freshener, a clock, or a connector forother electronic devices. If the attachment 15 is (or is for) anelectronic or electrical device, such as a clock or any electronicdevice, or a connector for such a device, then the safety plug 200 mayinclude conductors (electrical contacts) to transmit electricity fromthe power port. Examples of a display may include light-emitting diodedisplay, a liquid-crystal display, a thin-film-transistor display, and aplasma display. Examples of an electrical connector may include a jackfor a stereo mini plug, a jack for an RCA plug, etc.

FIG. 4 shows a safety plug 300 in accordance with another embodiment ofthe invention. As shown, the safety plug 300 includes two conductors(electrical contacts) 31, 32 and a wire 33 for providing electricalpower to the attachment 15. As shown, the electrical contact 31 isadapted to contact the positive terminal in the power port and theelectrical contact 32 is to provide a current return. The current returnelectrical contact 32 may not be needed, if the body 10 is made of aconductive material and can provide the conductive path. If the controldevice 20 is made of a conductive material, the electrical contact 31may be connected directly to the control device 20. Otherwise, theelectrical contact 31 may be connected to the attachment 15 via aconductive wire (not shown).

The locking device 13 may use any reversible mechanism that can preventthe safety plug from being pulled out of a power port by a child. FIG. 5shows one embodiment of a locking device 13 that comprises an adjustablediameter member. As shown, the locking device 13 is made of a flexiblematerial that is disposed between the first end 11 and the second end 12of the body 10. The flexible material, for example, may be rubber,plastic, or the like. The flexible material permits the locking device13 to change its diameter. While a single fold structure is illustratedfor the locking device 13 in FIG. 5, one of ordinary skill in the artwould appreciate that other configurations may be employed withoutdeparting from the scope of the invention. For example, the lockingdevice 13 may have multiple folds as in an accordion, or other suitablestructures.

As shown in FIG. 5, a spring 17 is provided to bias the control device20 in the up position so that the locking device 13 is at its maximumdiameter (i.e., the locked state). To unlock the safety plug 400 from apower port, the diameter of the locking device 13 can be reduced bypressing the control device 20 towards the first end 11 of the body 10.Thus, to remove the plug, two forces of opposite directions need to beapplied. This counter-intuitive mechanism can prevent a child frompulling the safety plug out of a power port without adult assistance.

The embodiment shown in FIG. 5 is for illustration only, otherconfigurations of the locking device 13 are possible. For example, thelocking device 13 may have selected portions protruding from slots cutin the body 10. Alternatively, the locking device 13 may not be made ofa flexible material.

FIG. 6 shows another embodiment of the locking device 13 that comprisesone or more protruding members 19 adapted to extend from the body 10 toengage a power port (not shown). The protruding members 19 are linked tothe control device 20 by levers 18 such that when the control device 20is pushed in, the protruding members 19 are pulled towards the body 10to disengage the safety plug from a power port (not shown). The levers18 and the protruding members 19 shown in FIG. 6 are for illustrationonly. One of ordinary skill in the art would appreciate that manymodifications are possible without departing from the scope of theinvention. For example, the protruding members 19 may be hinged at oneof its ends to the body 10, and the levers 18 may be replaced bysprings. The levers or springs 18 are generally referred to as a“retracting mechanism” in this description.

Advantages of the invention may include the following. A safety plug inaccordance with the invention can be easily deployed to block a powerport to prevent potential injuries to children. A safety plug of theinvention has a locking device with a child-proof control mechanism thatunlocks the locking device in a counter-intuitive manner. Therefore,children are not expected to be able to remove the safety plugs from thepower ports.. In addition, a safety plug of the invention may furtherprovide other functions such as a sign or a display. The safety plug mayalso provide a conduit to the power terminals in the power port suchthat other electrical or electronic devices may be convenientlyconnected.

While the invention has been described with respect to a limited numberof embodiments, those skilled in the art, having the benefit of thisdisclosure, will appreciate that other embodiments can be devised whichdo not depart from the scope of the invention as disclosed herein.

1. A safety plug, comprising: a body having a first end adapted to beinserted into a mobile power port; a locking device connected to thebody for reversibly engaging an inside of the mobile power port; and acontrol device operatively coupled to the locking device for disengagingthe locking device from the inside of the mobile power port, wherein thecontrol device comprises a child-resistant mechanism.
 2. The safety plugof claim 1, wherein a second end of the body comprises an attachment. 3.The safety plug of claim 2, wherein the attachment is one selected froma display, a clock, and a sign.
 4. The safety plug of claim 1, whereinthe control device comprises a shaft slideably disposed in the body. 5.The safety plug of claim 1, wherein a first end of the control device isconnected to the locking device.
 6. The safety plug of claim 1, whereina second end of the control device protrudes from a second end of thebody.
 7. The safety plug of claim 6, wherein the second end of thecontrol device comprises an attachment.
 8. The safety plug of claim 7,wherein the attachment is one selected from a display, a clock, and asign.
 9. The safety plug of claim 1, wherein the locking devicecomprises an adjustable diameter member.
 10. The safety plug of claim 1,wherein the locking device comprises at least one protruding member anda retracting mechanism.
 11. The safety plug of claim 1, furthercomprising: at least one electrical contact on the first end of the bodyfor conducting electricity from the mobile power port; and an electricaldevice disposed proximate to a second end of the body and electricallyconnected to the at least one electrical contact, wherein the electricaldevice is configured to be powered by the electricity from the mobilepower port.
 12. The safety plug of claim 11, wherein the electricaldevice comprises one selected from a light, a display, and an electricalconnector.
 13. The safety plug of claim 12, wherein the display is oneselected from a light-emitting diode display, a liquid-crystal display,a thin-film-transistor display and a plasma display.
 14. The safety plugof claim 11, wherein the electrical device is attached to the second endof the body.
 15. A safety plug, comprising: a body having a first endadapted to be inserted into a power port; a locking device connected tothe body for reversibly engaging an inside of the power port; a controldevice operatively coupled to the locking device for disengaging thelocking device from the inside of the power port, at least oneelectrical contact on the first end of the body for conductingelectricity from the power port; and an electrical device disposedproximate to a second end of the body and electrically connected to theat least one electrical contact, wherein the electrical device isconfigured to be powered by the electricity from the power port, whereinthe control device comprises a child-resistant mechanism, wherein theelectrical device is attached to a second end of the control device. 16.A safety plug, comprising: a body having a first end adapted to beinserted into a mobile power port; means for reversibly engaging aninside of the mobile power port; and means for controlling the engagingmeans, wherein the controlling means comprises a child-resistantmechanism.